When the custom driver made by Alex Igrushkin stopped working for CRM 2013 and 2015 and it appeared that there wouldn't be any upgrade as well, I was very disappointed. As a CRM developer I use a lot of LINQ queries and I loved to be able to execute and debug these queries in LINQPad before building and publishing plugins and such.
Today I discovered this MSDN post where Kenichiro Nakamura anouched he and his team released a new driver called "LINQPad 4 Driver for Dynamics CRM"
This is a great way to be able to work directly with your CRM data so thanks a lot Kenichiro!
As you can see this way you can access your data as if you where working with SQL Server Management Studio and you can execute queries, quick reference names of tables and columns and much more...